One of the methods to calculate Actuals for sales agreements is to automatically derive them from direct orders. A direct order is an order that is created from the related list of a sales agreement record. A daily automated process calculates the product quantity fulfilled in each activated order, and then updates that quantity in the sales agreement. This method allows you to track the actual performance of your sales agreements based on the orders placed by your customers or partners. You can also use other methods to calculate Actuals, such as importing quantities from external sources, or using orders associated with contracts. Reference: Create Orders to Calculate Sales Agreement Actuals, How Are Sales Agreement Actuals Calculated?

Explanation
Salesforce Manufacturing Cloud can be integrated with Oracle ERP orders data using two options:
Use an AppExchange ISV solution: This option allows you to leverage existing solutions from independent software vendors (ISVs) that are available on the Salesforce AppExchange platform. These solutions are designed to simplify and automate the integration process between Salesforce and Oracle ERP systems. Some examples of AppExchange ISV solutions are rSTAR, DBSync, and Jitterbit.
Use API integration with custom logic: This option allows you to use the Salesforce APIs and the Oracle ERP APIs to create custom logic for integrating the orders data between the two systems. You can use any programming language or tool that supports REST or SOAP web services to build the integration logic. You can also use the MuleSoft Accelerator for Manufacturing, which is a prebuilt integration solution that connects Salesforce Manufacturing Cloud with Oracle ERP Cloud1.
References:
ERP and Salesforce: Everything Manufacturers Need To Know
Integrate Salesforce.com with Oracle Integration Cloud
Oracle Cloud Using the Salesforce Adapter with Oracle Integration Cloud All About Integrating Oracle ERP and Salesforce CRM-rSTAR Technologies What Is Manufacturing Cloud? - Salesforce